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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368739f031b2f22d18bed485739c1063afdc271634d32459e225a9e53de0b93e' 
  AND token = 'If6gOJTFihR1RNpGBzWY+ESNm7HLSKoPQ4cUQtc7PxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}